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Figure 1 Pulsed Doppler mitral flow velocity (left panel) and contrast-enhanced pulmonary venous flow velocity (right panel) in a patient with LV systolic dysfunction. Mitral A-wave duration (measured from the start of flow until flow ceases) was 125 ms. Pulmonary vein atrial reversal duration (from onset to the cessation of reversed flow) was 175 ms. The difference was 50 ms. Assessment of pulmonary venous flow variables was accomplished after venous contrast administration.